Feature: 1. When the power supply has power, the power supply is preferred to supply power to the load. 2. When the power supply is out of power, it will automatically switch to the battery to supply power to the load. At the same time, the power supply charges the battery. 3. When the battery is under‑voltage, it starts charging, and when the battery is over‑voltage, it stops charging. Whether the power supply can full charge the battery depends on the power supply voltage, current and battery capacity. 4. Clockwise regulation voltage is high, counterclockwise regulation voltage is low, charging start voltage regulation. Charge off voltage regulation, clockwise regulation voltage is high, counterclockwise regulation voltage is low. 5. Advanced manufacturing technology, high reliability and stable performance. Conform to strict quality control standards, dependable to use. Specification: Condition: 100% Brand New Item Type: Automatic Power Switch Module Material: Plastic Color: As picture shown Model: YX851 Control Voltage: DC 12V Control Current: 10A Size (LxWxH): Approx. 69 x 48 x18mm/2.7 x 1.9 x 0.7in Mounting Size: Approx. 61 x 41mm/2.4 x 1.6in. Package List: 1 x Automatic Power Switch Module